Format to be displayed in the rear screen: NSS/Race Number
Vinyl lettering, not shoe whitener, please.  "NSS/   " can be pretty much any size, but the race number should be 3" high.
The list of race numbers already used:

0-10 aren't available

11
13

14

18

20

21

22
23
24
25

26
28
30
34

35

37
42

43
47

50

52

53
54
56
57

59
61
63

64

65

66

67

68

69

70

71

72

73

76

77

78
79
81
82
85
86

87

88

91

93
99
100

101

103
106
123
127
138

139
149

​​